Deprecation warning on python 3.7

[knaveofdiamonds]

Importing osmium and running with warnings turned on or running under pytest produces the following deprecation warning on python 3.7.4 and 3.7.3:

_frozen_importlib:219: DeprecationWarning: __int__ returned non-int (type bool).  The ability to return an instance of a strict subclass of int is deprecated, and may be removed in a future version of Python.

To replicate, create a file foo.py with:

import osmium

And then run python -Wd foo.py.

I can't see anything obvious in any of the python code, maybe this is something in the C++ bindings (which I don't know much about)?

[lonvia]

The problem is with the bool-typed enum classes osmium:geom:use_nodes and osmium:geom:direction. pybind11 seems to not properly translate them into their underlying type. There is a similar issue about char-typed enums and a PR with a fix for it. So I guess this needs digging into pybind11.

[lonvia]

I can confirm that this is fixed with the latest pybind11 versions.